114 PROCEEDINGS OF THE ROYAl, SOCIETY OF QUEENSLAND. 



results Avill not necessarily te obtained in our Western areas 

 as in Brisbane. It might be expected, for example, that 

 maggots would pupate to a much larger extent in the wool, 

 and beneath the carcass of a dead sheep (where they would be 

 accessible to the chalcid), than they would in less protected 

 places, such as under a piece of dry meat.^ Experiments 

 carried out with rather large surfaces, such as sheep's heads 

 spht down the centre to produce greater areas for protection, 

 indicate that this does not make much difference. In view 

 of the unfavourable results to be described, obtained locally 

 Mith Na-sonia, it seems at least worth while to repeat the 

 experiments with various species of larvae under sheep-country 

 conditions during different portions of the year. 



In January, 1921 (i.e. during the hottest part of the year), 

 Lucilia sericata and Sarcophaga spp. were allowed to infect 

 meat placed on dry soil. The experiment was carried out in 

 the shade. After the maggots had ceased feeding the meat 

 had to a great extent disappeared, only the fibrous portion 

 remaining and producing an excellent shelter for pupating 

 maggots. Different layers of the underlying soil were then 

 removed and the pupae in eacli laj'er counted, the following 

 results being obtained : — 



L. sericata. 



Sarcophaiju spp. 



Xiiinber of pupaj — 



Dn surface or partly exposed 



To depth of | in. 



From % to 2t ill. 



From 2f to 3i in. 



From 83 to 5 in. 



From 5 to 6 in. 



Percentage on surfac 



JO.-) 

 ()«3 



1.4(i:', 



Ml 



14 

 47 



4 



4-3'; 



1 J. L. Froggatt (1919, p. 260) has stated that it is generally amongst 

 llie pupae of P. riifijacies and to a less extent P. varipes that Nasonia 

 is actually found to woik in the field, this being due largely to the habits 

 of the larvae of these particular species, which usually pupate under the 

 edge of the carcass remains or on the hones, mooI, etc., instpfirl of crawling 

 away as the maggots of other blowflies do. 



